Imaging for local scaling

ABSTRACT

An imaging method and device are provided for local scaling. The method can comprise determining a gazed object of an eye, determining the corresponding sub-areas of an imaging lens group according to the gazed object, the imaging lens group being configured to scale and image for the gazed object, comprising a plurality of sub-areas with adjustable scaling property, and determining the scaling parameter of the corresponding sub-areas according to the gazed object. In the method and the device of at least one embodiment of this application, the images of the gazed object in the user&#39;s fundus can be scaled in a local scaling mode, so as to avoid changing the overall view of the user and to enable the user to conveniently observe the gazed object and to simultaneously correctly perceive the surrounding environment.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a national stage application of InternationalApplication No. PCT/CN2014/081492, filed on Jul. 2, 2014, which claimspriority to and benefits of Chinese Patent Application No.201310461019.1, entitled “Imaging Method and Device for Local Scaling”,filed on Sep. 30, 2013. The contents of both of the above-referencedapplications are incorporated herein by reference in their entirety.

TECHNICAL FIELD

This application relates to the technical field of imaging, and, moreparticularly, to imaging for local scaling.

BACKGROUND

For users with healthy eyes, when the objects viewed are smaller orfarther, it is difficult for the eyes to observe desired details. Forexample, when persons sit in farther positions to view a ball game, itis difficult to view the details of limb movement and expressions ofathletes. For users whose eyes per se have shortsightedness orfarsightedness, when the objects viewed are smaller or farther, it ismore difficult for the eyes to identify the details of the objects orpersons viewed. Conversely, when the objects viewed are too large or tooclose, it is difficult for the users to observe the global informationof the gazed at objects. For example, when the users stand in front of ahigh building or a mountain, it is difficult to observe the overallsituation of the high building or the mountain.

Conventional optical scaling devices, such as a telescope or a magnifierusually adopt global unified scaling. FIG. 1a is a schematic diagram ofthe view of a user, wherein A, B, C represent three objects in the view110. Assuming that the user wants to amplify the viewing object B, asshown in FIG. 1b , when a global unified scaling mode is adopted, theobject B is amplified and meanwhile, the object C is also amplified,while the object A is out of the view 110, that is, at this moment, theuser cannot see the object A. Thus, global unified scaling will cause achange in the integral view of the user. In many scenes, such as AR(Augmented Reality) environment, they will bring discomfort to the user,causing inconvenience for use.

SUMMARY

The following presents a simplified summary in order to provide a basicunderstanding of some example embodiments disclosed herein. This summaryis not an extensive overview. It is intended to neither identify key orcritical elements nor delineate the scope of the example embodimentsdisclosed. Its sole purpose is to present some concepts in a simplifiedform as a prelude to the more detailed description that is presentedlater.

At least one embodiment in this application aims at: providing animaging device and method for local scaling so as to facilitate the userto view the gazing object.

According to one example embodiment of this application, a methodcomprises:

determining, by a system comprising a processor, a gazed object at whichan eye is gazing;

determining corresponding sub-areas of an imaging lens group accordingto the gazed object, the imaging lens group being configured to scaleand image for the gazed object, comprises a plurality of sub-areas withadjustable scaling property; and

determining a scaling parameter of the corresponding sub-areas accordingto the gazed object.

According to another example embodiment of this application, an imagingdevice comprises:

an object determining unit configured to determine a gazed object of aneye;

an imaging lens group configured to scale and image for the gazedobject, comprising a plurality of sub-areas with an adjustable scalingproperty;

a sub-area determining unit configured to determine correspondingsub-areas of the imaging lens group according to the gazed object; and

a parameter determining unit configured to determine a scaling parameterof the corresponding sub-areas according to the gazed object.

According to another example embodiment of this application, a computerreadable storage device, comprising at least one executable instruction,which, in response to execution, causes an imaging device comprising aprocessor to perform operations, comprising:

determining a gazed object of an eye;

determining corresponding sub-areas of an imaging lens group accordingto the gazed object; and

determining a scaling parameter of the corresponding sub-areas accordingto the gazed object.

According to another example embodiment of this application, an imagingdevice, characterized by comprising a processor and a memory, the memorystoring the executable instructions, the processor being connected withthe memory through a communication bus, wherein, when the imaging deviceis operating, the processor executes or facilitates execution of theexecutable instructions stored by the memory to cause the imaging deviceto perform operations, comprising:

determining a gazed object of an eye;

determining corresponding sub-areas of an imaging lens group accordingto the gazed object; and

determining a scaling parameter of the corresponding sub-areas accordingto the gazed object.

In the method and the device of at least one embodiment in this exampleembodiment, adopts the imaging lens group comprising a plurality ofsub-areas with adjustable scaling property to scale and image for thegazing object of the eye and can automatically determine the scalingparameter of the corresponding sub-areas according to the gazing object,thus scaling the images of the gazing object on the user's fundus bylocally scaling, avoiding changing the whole view of the user,facilitating the user's observation for the gazing object and alsoenabling the user to correctly perceive the surrounding environment.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1a is an example schematic diagram of the view of a user;

FIG. 1b is an example schematic diagram after objects in the view of theuser are uniformly scaled;

FIG. 1c is an example schematic diagram after objects in the view of theuser are locally scaled;

FIG. 2 is an example flow diagram of the imaging method for localscaling in an embodiment of this application;

FIG. 3a is an example structural diagram of a module of animplementation of the imaging device for local scaling in an embodimentof this application;

FIG. 3b is an example structural diagram of a module of the objectdetermining unit in an embodiment of this application;

FIG. 3c is an example structural diagram of a module of the first objectdetermining sub-unit in an embodiment of this application;

FIG. 3d is an example structural diagram of another module of the firstobject determining sub-unit in an embodiment of this application;

FIG. 3e is an example structural diagram of another module of the firstobject determining sub-unit in an embodiment of this application;

FIG. 3f is an example structural diagram of a module of the objectdetermining unit in an embodiment of this application;

FIG. 3g is an example structural diagram of a module of the parameterdetermining unit in an embodiment of this application;

FIG. 3h is an example structural diagram of a module of the firstparameter determining sub-unit in an embodiment of this application;

FIG. 3i is an example structural diagram of another module of the firstparameter determining sub-unit in an embodiment of this application;

FIG. 3j is an example structural diagram of a module of the parameterdetermining unit in an embodiment of this application;

FIG. 3k is an example structural diagram of a module of the secondparameter determining sub-unit in an embodiment of this application;

FIG. 3L is an example structural diagram of another module of the secondparameter determining sub-unit in an embodiment of this application;

FIG. 4 is an example structural diagram of a module of anotherimplementation of the imaging device for local scaling in an embodimentof this application;

FIG. 5a is an example structural diagram of a module of animplementation of the focus point detecting system of an eye in anembodiment of this application;

FIG. 5b is an example structural diagram of a module of anotherimplementation of the focus point detecting system of an eye in anembodiment of this application;

FIG. 5c is an example structural diagram of a module of the determiningunit of optical axis direction of an eye in an embodiment of thisapplication;

FIG. 5d is an example structural diagram of another module of thedetermining unit of optical axis direction of an eye in an embodiment ofthis application;

FIG. 5e is an example diagram of a facula pattern in an embodiment ofthis application;

FIG. 5f is an example fundus image captured when the facula pattern isprojected in an embodiment of this application;

FIG. 5g is an example diagram of eye imaging in an embodiment of thisapplication;

FIG. 5h is an example diagram of a distance from the focus point of aneye to the eye acquired according to the known optical parameter of thesystem and the optical parameter of the eye in this application;

FIG. 6 is an example diagram of a specific example when the focus pointdetecting system of an eye is applied to glasses in an embodiment ofthis application;

FIG. 7a is an example diagram of a specific example when the imagingdevice for local scaling is applied to glasses in an embodiment of thisapplication;

FIG. 7b is an example diagram of a sub-area when the imaging device forlocal scaling is applied to glasses in an embodiment of thisapplication;

FIG. 8a and FIG. 8b are example diagrams of the application scenes ofthe imaging device for local scaling in an embodiment of thisapplication; and

FIG. 9 is an example structural diagram of the imaging device for localscaling in an embodiment of the present invention.

DETAILED DESCRIPTION

The concrete implementations of this application are further describedin details in combination with the drawings and the embodiments. Thefollowing embodiments are used for illustrating this application, but donot limit the range of this application.

In many application scenes, the user only hopes to locally scale theviewed object and keep a feeling of distance from the surroundingenvironment. For example, when the user is driving, the user hopes tocarefully observe the license plate numbers of front distant vehicleswhile does not hope to neglect other vehicles on the road (if othervehicles are neglected, danger may occur). At this time, the unifiedscaling mode should not be used for changing the overall view of theuser. Thus, at least one embodiment of this application provides animaging method for local scaling. When the method of this embodiment isadopted for amplifying the object B in the user's view shown in FIG. 1a, its effect is shown in FIG. 1c . It can be seen that in the amplifiedview, only the object B is amplified, while the object A and the objectC keep the original objects. Moreover, the integral size of the user'sview is not changed, and the object A is still within the view 110.

As shown in FIG. 2, the method comprises:

S210: determining the gazing object of an eye.

Wherein, the gazing object generally means an object, a person, etc.viewed by the user with the observing time more than predetermined time,and may be a static object or a mobile object.

S220: determining the corresponding sub-areas of an imaging lens groupaccording to the gazing object.

Wherein, the imaging lens group is configured to scale and image for thegazing object, comprising a plurality of sub-areas with adjustablescaling property.

S230: determining the scaling parameter of the corresponding sub-areasaccording to the gazing object; and

adjusting the scaling property of the corresponding sub-areas accordingto the scaling parameter after determining the scaling parameter.

In the method of this embodiment, adopts the imaging lens groupcomprising a plurality of sub-areas with adjustable scaling property toscale and image for the gazing object of the eye and can automaticallydetermine the scaling parameter of the corresponding sub-areas accordingto the gazing object, thus scaling the images of the gazing object onthe user's fundus by locally scaling, preventing the whole view of theuser from being changed, and facilitating the user's observation for thegazing object.

Specifically, the step S210 can adopt any one of the following severalrealization ways:

1) detecting the position of the focus point of the eye, and determiningthe gazing object according to the position of the focus point of theeye.

Wherein, the detection of the position of the focus point of the eye mayhave several realization ways, and three optional realization ways areprovided as follows:

a) determining the position of the focus point of the eye according toan optical parameter corresponding to images presented on the fundus andwith the clarity greater than a preset value; and the optical parameterbeing the optical parameter of an optical path between an imagecollection position and the eye.

Specifically, the realization way a) comprises:

S111: collecting fundus images.

S112: adjusting the imaging parameter of the optical path between theeye and the image collection position for collecting images with theclarity greater than the preset value.

S113: processing the collected images; acquiring the optical parameterof the eye according to an imaging parameter corresponding to the imageswith the clarity greater than the preset value; and the imagingparameter being the imaging parameter of the optical path between theimage collection position and the eye. The step S113 specificallycomprises: analyzing the collected images to find out the images withthe clarity greater than the preset value; and calculating the opticalparameter of the eye according to the images with the clarity greaterthan the preset value and the imaging parameter of the optical pathcorresponding to the images with the clarity greater than the definedvalue.

Wherein, in the step S113, in order to improve the accuracy, thecollected images may be analyzed to select out the clearest image fromthe images with the clarity greater than the preset value, and theoptical parameter of the eye is calculated according to the clearestimage and the imaging parameter of the optical path corresponding to theclearest image.

S114: calculating the position of the focus point of the eye accordingto the optical parameter of the eye. Wherein, the optical parameter ofthe eye comprises: equivalent focal length and line-of-sight directionof the eye.

b) tracking the line-of-sight directions of two eyes and acquiring theposition of the focus point of the eye through the intersection of theline-of-sight directions of the two eyes.

c) tracking the line-of-sight directions of the eye; acquiring the scenedepth of the position of the focus point containing the eye according tothe line-of-sight directions; and calculating and acquiring the positionof the focus point of the eye according to the scene depth.

2) collecting fundus images and determining the gazing object accordingto the fundus images.

There is a macular area in the center of the retina of human fundus, andthe macular area, located in the central optical zone of human eye, is aprojection point of the eye light axis. A depression in the center ofthe yellow spot, known as a central fovea, is the sharpest part of aneye, and the eye's gazing object is projected to the central fovea ofthe macular area. Accordingly, the user's gazing object may bedetermined by collecting the corresponding images at the central foveaof the macular area in the fundus images.

When corresponding sub-areas of the imaging lens group are determined inthe step S120, the corresponding sub-areas may be determined accordingto the projection of the gazing object on the imaging lens group.

Wherein, the imaging lens group comprises at least two lenses, and theat least two lenses being adjustable in scaling property with eachcorresponding portion of the sub-areas. The scaling property may beadjusted by changing the respective focal lengths of the at least twolenses or by changing the relative position between the at least twolenses. In the imaging lens group, the sub-areas are distributed in anarray, such as in a rectangular array, or distributed in a radialconcentric circle array.

The projection of the gazing object on the imaging lens group along theline-of-sight directions covers some relevant sub-areas, i.e., thecorresponding sub-areas, and these corresponding sub-areas covered bythe projection are the sub-areas required to be adjusted in the scalingproperty.

After the sub-areas required to be adjusted in the scaling property aredetermined, the corresponding scaling parameter is required to bedetermined. The step S130 may use any one of the following severalimplementations:

1) The scaling parameter of the corresponding sub-areas is determinedaccording to the actual viewing distance from the gazing object to theeye. Specifically, this manner 1) may also comprise:

Mode d:

acquiring the actual viewing distance from the gazing object to the eye;and

determining the scaling parameter of the corresponding sub-areasaccording to the actual viewing distance. Alternatively,

Mode e:

presetting the target viewing distance from the gazing object to the eyeand the buffer of the target viewing distance;

acquiring the actual viewing distance from the gazing object to the eye;and

determining the scaling parameter of the corresponding sub-areasaccording to the target viewing distance, the actual viewing distanceand the buffer.

Wherein, in the modes d and e, acquiring the actual viewing distancefrom the gazing object to the eye may be realized according to theequivalent focal length of the eye in above mode a or by calculating thesame after the position of the focus point of the eye is acquiredaccording to the above modes b and c.

In mode d, the scaling parameter of the corresponding sub-areasdetermined according to the actual viewing distance may be amagnification, and there are various modes for acquiring themagnification according to the actual viewing distance; for example, thecorresponding magnification is determined according to a piecewisefunction corresponding to the viewing distance or by looking up thetable. This implementation selects a quick way of looking up table,i.e., presetting a corresponding relation table between the actualviewing distance and the magnification, and then determining thecurrently needed magnification by looking up the table during theimplementation of the method. Wherein, the magnification may be 1, aconstant greater than 1, or a grade greater than zero and smallerthan 1. Table 1 below is an example of a magnification list, and it isobserved that corresponding to each actual viewing distance D₀, a presetmagnification T₂ is stored in Table 1; for example, when the actualviewing distance D₀ is 20 m, its corresponding magnification may bedetermined as 5 by looking up the table.

TABLE 1 First Magnification List Actual Viewing Distance D_(O) (in m)Magnification T₂    D_(O) > 100 10  10 < D_(O) ≤ 100 5  1 < D_(O) ≤ 10 20.3 < D_(O) ≤ 1   1 0.1 < D_(O) ≤ 0.3 ⅔   0 < D_(O) ≤ 0.1 ½

In mode e, the target viewing distance is the viewing distance of user'seye expected to reach, i.e., the desired value of the viewing distancewhen the user observes the gazing object, such as 10 m. When the user'seye's actual viewing distance is the target viewing distance, the userwill feel that the distance from the gazing object to the himself orherself is moderate and the fundus images will be not too large or toosmall. Besides, the target viewing distance that makes the user feelcomfortable is generally not a distance point, but rather a distancerange; accordingly, the buffer of the target viewing distance is alsoarranged in the mode e. Generally, the buffer of the target viewingdistance is the distance range preset between both sides of the targetviewing distance. For example, assuming that the target viewing distanceis D_(T), the buffer may be ((D_(T)−D_(L), D_(T))∪(D_(T), D_(T)+D_(R))),wherein, D_(T), D_(L) and D_(R) are constants. Consequently, the viewingdistance scope (D_(T)−D_(L), D_(T)+D_(R)) is set to the viewing distancescope that makes the user feel comfortable. D_(L) may be equal to D_(R);in this case, the first sub-buffer ((D_(T)−D_(L), D_(T)) and the secondsub-buffer (D_(T), D_(T)+D_(R)) of the buffer of the target viewingdistance are of equal size and take D_(T) as the center; and D_(L) mayalso be unequal to D_(R); in this case, the first sub-buffer((D_(T)−D_(L), D_(T)) and the second sub-buffer (D_(T), D_(T)+D_(R))vary in size.

In the step of determining the scaling parameter of the correspondingsub-areas according to the target viewing distance, the actual viewingdistance and the buffer, for the scaling parameter:

Under the circumstance that the actual viewing distance is less than thetarget viewing distance and the actual viewing distance is beyond thebuffer of the target viewing distance, after the scaling property of thecorresponding sub-areas is adjusted according to the scaling parameter,the actual viewing distance will be increased to the target viewingdistance, to shrink the fundus images of the gazing object.

Under the circumstance that the actual viewing distance is greater thanthe target viewing distance and the actual viewing distance is beyondthe buffer of the target viewing distance, after the scaling property ofthe corresponding sub-areas is adjusted according to the scalingparameter, the actual viewing distance will be decreased to the targetviewing distance, to amplify the fundus images of the gazing object.

In some implementations demanding simple control, the buffer of thetarget viewing distance may be set as zero, i.e., equivalent to thebuffer without setting the target viewing distance; in this case, thisis equivalent to determining the scaling parameter of the correspondingsub-areas according to the target viewing distance and the actualviewing distance, for the scaling parameter:

Under the circumstance that the actual viewing distance is less than thetarget viewing distance, after the scaling property of the correspondingsub-areas is adjusted according to the scaling parameter, the actualviewing distance will be increased to the target viewing distance, toshrink the fundus images of the gazing object.

Under the circumstance that the actual viewing distance is greater thanthe target viewing distance, the scaling property of the correspondingsub-areas is adjusted according to the scaling parameter, the actualviewing distance will be decreased to the target viewing distance, toamplify the fundus images of the gazing object.

2) determining the scaling parameter of the corresponding sub-areasaccording to the actual area proportion of the fundus images of thegazing object on the fundus. Specifically, this manner 2) may alsocomprise:

Mode f:

acquiring the actual area proportion of the fundus images of the gazingobject on the fundus; and

determining the scaling parameter of the corresponding sub-areasaccording to the actual area proportion. Alternatively,

Mode g:

presetting the target area proportion of the fundus images of the gazingobject on the fundus and the buffer of the target area proportion;

acquiring the actual area proportion of the fundus images of the gazingobject on the fundus; and

determining the scaling parameter of the corresponding sub-areasaccording to the target area proportion, the actual area proportion andthe buffer.

Wherein, in modes d and e, the area of the user's fundus is generallyfixed, after the user's fundus images are collected, the images in thecentral fovea area of the yellow spot may be extracted therefrom andused as the fundus images of the gazing object, such that the area ofthe fundus images of the gazing object may be acquired and then theactual area proportion of the fundus images of the gazing object on thefundus may be acquired.

In the mode f, the scaling parameter of the corresponding sub-areasdetermined according to the actual area proportion may be amagnification, and there are various modes for determining thecorresponding magnification according to the actual area proportion, forexample, the corresponding magnification is determined according to thepiecewise function corresponding to the actual area proportion or bylooking up the table. This implementation selects a quick way of lookingup table, i.e., presetting a corresponding relation table between theactual area proportion and the magnification, and then determining thecurrently needed magnification by looking up the table during theimplementation of the method. Wherein, the magnification may be 1, aconstant greater than 1, or a grade greater than zero and smallerthan 1. Table 2 below is an example of a magnification list, and it isobserved that corresponding to each actual area proportion S_(RE), apreset magnification T₁ is stored in Table 2; for example, when theactual area proportion S_(RE) is 20%, its corresponding magnificationmay be determined as 2 by looking up the table.

TABLE 2 Second Magnification List Actual Area Proportion S_(RE)Magnification T₁  0 < S_(RE) ≤ 5% 15  5% < S_(RE) ≤ 10% 6 10% < S_(RE) ≤30% 2 30% < S_(RE) ≤ 70% 1 70% < S_(RE) ≤ 90% ⅔  90% < S_(RE) ≤ 100% ½

In the mode g, the target area proportion is the area proportion of thefundus images of the gazing object on the fundus expected to achieve,such as 50%. Under the circumstance that the area proportion of thefundus images of the gazing object on the fundus is the target areaproportion, the user will feel that the distance from the gazing objectto himself or herself is moderate and the fundus images will be not toolarge or too small. Besides, the area proportion of the fundus images ofthe gazing object that makes the user feel comfortable is generally notan area proportion point, but rather an area proportion range;accordingly, the buffer of the target area proportion is also arrangedin the mode g. Generally, the buffer is the area proportion range presetbetween both sides of the target area proportion. For example, assumingthat the target area proportion is S_(T), the buffer may be((S_(T)−S_(L), S_(T))∪(S_(T), S_(T)+S_(R))), wherein, and v areconstants. Consequently, the region of area proportion S_(T)−S_(L),S_(T)+S_(R)) is set as the region of area proportion that makes the userfeel comfortable. S_(L) may be equal to S_(R); in this case, the thirdsub-buffer (S_(T)−S_(L), S_(T)) and the fourth sub-buffer (S_(T),S_(T)+S_(R)) of the buffer are of equal size and take S_(T) as thecenter; and S_(L) may also be unequal to S_(R); in this case, the thirdsub-buffer (S_(T)−S_(L), S_(T)) and the fourth sub-buffer (S_(T),S_(T)+S_(R)) vary in size.

In the step of determining the scaling parameter of the correspondingsub-areas according to the target area proportion, the actual areaproportion and the buffer, for the scaling parameter:

In the case that the actual area proportion is less than the target areaproportion and the actual area proportion is beyond the buffer, afterthe scaling property of the corresponding sub-areas is adjustedaccording to the scaling parameter, the fundus images of the gazingobject may be amplified to the target area proportion.

In the case that the actual area proportion is greater than the targetarea proportion and the actual area proportion is beyond the buffer,after the scaling property of the corresponding sub-areas is adjustedaccording to the scaling parameter, the fundus images of the gazingobject may be shrunk to the target area proportion.

In some implementations demanding simple control, the buffer may also beset as zero, i.e., equivalent to not setting the buffer; in this case,this is equivalent to determining the scaling parameter of thecorresponding sub-areas according to the target area proportion and theactual area proportion, for the scaling parameter:

In the case that the actual area proportion is less than the target areaproportion, after the scaling property of the corresponding sub-areas isadjusted according to the scaling parameter, the fundus images of thegazing object may be amplified to the target area proportion.

In the case that the actual area proportion is greater than the targetarea proportion, after the scaling property of the correspondingsub-areas is adjusted according to the scaling parameter, the fundusimages of the gazing object may be shrunk to the target area proportion.

In order to avoid the condition that the user's fundus images arechanged in ungazing state, such as random sweeping, to affect the userexperience, the method may also comprise:

S240: judging whether the time for the eye to observe the gazing objectexceeds the predetermined time or not, and if exceeded, executing thesteps S220 and S230.

Wherein, the predetermined time shall be set in such a manner to justmake sure that the user is gazing the current observation object, andgenerally, when human eyes view a target, an optical impression may beobtained with the minimum observation time of 0.07-0.3 s, and thepredetermined time shall be more than the minimum observation time; forexample, it may be set at 1 s, 2 s, etc. In addition, the time for theuser to observe the gazing object may be acquired by monitoring the timewhen the position of the focus point of user's eye remains unchanged,and under the circumstance that the time when the position of the focuspoint of user's eye remains unchanged exceeds the predetermined time, itcan be judged that the user is currently gazing the object in theposition of the focus point, or acquired by monitoring the dwell time ofthe corresponding image in the central fovea of the yellow spot, andunder the circumstance that the dwell time of the image corresponding tothe same object in the central fovea exceeds the predetermined time, itcan be judged that the user is currently gazing the object.

When the gazing object is a mobile object, the judgment is only made inthe beginning on whether the time for the eye to observe the mobileobject exceeds the predetermined time, once the time is judged to exceedthe predetermined time, the steps S220 and S230 are triggered; and whenthe user's line-of-sight follows the mobile object, the judgment wouldnot be made again on whether the gazing time exceeds the predeterminedtime as long as the user's eye are gazing the mobile object all the time(the user does not need to turn his or her head but move his or hereyeballs only), thereby facilitating the user in observing the scalingof the mobile object.

In addition, human eyes may have ametropia problems such asfarsightedness, nearsightedness and/or astigmatism, and therefore, themethod also comprises:

S250: judging whether the eye have ametropia problems and generating theametropia information about the eye if the eye have ametropia problems;

correspondingly, in this case, the step S230 comprises:

determining the scaling parameter of the corresponding sub-areasaccording to the gazing object and the ametropia information.

It should be understood that, in various embodiments of the presentinvention, the sequence numbers of the above processes do not imply anexecution sequence, and the execution sequence of the processes shouldbe determined according to the functions and internal logic, which isnot intended to limit the implementation processes of the embodiments ofthe present invention in any way.

From the above, the method of this embodiment can scale the images ofthe gazing object on the user's fundus in a local scaling mode, so as toavoid changing the overall view of the user and to facilitate the user'sobservation for the gazing object.

Furthermore, the embodiment of this application also provides a computerreadable medium comprising computer readable instructions whichimplement the following operation when they are executed: the operationof executing the steps S210, S220 and S230 of the method in theabove-mentioned implementation shown in FIG. 2.

The embodiment of this application also provides an imaging device forlocal scaling, as shown in FIG. 3a , the device 300 comprises: an objectdetermining unit 310, an imaging lens group 320, a sub-area determiningunit 330 and a parameter determining unit 340.

The object determining unit 310 is configured to determine the gazingobject of the eye.

The imaging lens group 320 is configured to scale and image for thegazing object and comprises a plurality of sub-areas with adjustablescaling property.

The sub-area determining unit 330 is configured to determine thecorresponding sub-areas of the imaging lens group according to thegazing object.

The parameter determining unit 340 is configured to determine thescaling parameter of the corresponding sub-areas according to the gazingobject.

The device of this embodiment uses the imaging lens group comprising aplurality of sub-areas with adjustable scaling property to scale andimage for the gazing object of the eye and can automatically determinethe scaling parameter of the corresponding sub-areas according to thegazing object, thus scaling the images of the gazing object on theuser's fundus in a local scaling mode, so as to avoid changing theoverall view of the user and to facilitate the user's observation forthe gazing object.

Specifically, the object determining unit 310 may use any one of thefollowing several implementations:

1) As shown in FIG. 3b , the object determining unit 310 may comprise afirst object determining sub-unit 310′ configured to detect the positionof the focus point of an eye and determining the gazing object accordingto the position of the focus point of the eye.

Wherein, the function of the first object determining sub-unit 310′ maybe realized in various modes and three optional implementations areprovided as follows:

a) As shown in FIG. 3c , the first object determining sub-unit 310′ maycomprise a first focus point detecting module 310 a′ configured todetermine the position of the focus point of the eye according to anoptical parameter corresponding to the images presented on the fundusand with the clarity greater than a preset value, and the opticalparameter being the optical parameter of the optical path between theimage collection position and the eye.

Specifically, the first focus point detecting module 310 a′ comprises:

an image collecting sub-module 311 a′ configured to collect fundusimages;

an image adjusting sub-module 312 a′ configured to adjust the imagingparameter of the optical path between the eye and the image collectionposition to collect the images with the clarity greater than the presetvalue; and

an image processing sub-module 313 a′ configured to process the collectimages and acquire the eye's optical parameter according to the imagingparameter corresponding to the images with the clarity greater than thepreset value, and the imaging parameter being the imaging parameter ofthe optical path between the image collection position and the eye. Theimage processing sub-module is specifically configured to: analyze thecollected images to find out the images with the clarity greater thanthe preset value; and calculate the optical parameter of the eyeaccording to the images with the clarity greater than the preset valueand the imaging parameter of the optical path corresponding to theimages with the clarity greater than the preset value. Wherein, in orderto improve the accuracy, the collected images may be analyzed to selectout the clearest image from the images with the clarity greater than thepreset value, and the optical parameter of the eye is calculatedaccording to the clearest image and the imaging parameter of the opticalpath corresponding to the clearest image.

a focus point determining sub-module 314 a′ configured to calculate theposition of the focus point of the eye according to the opticalparameter of the eye. Wherein, the optical parameter of the eyecomprises: equivalent focal length and line-of-sight directions of theeye.

The function of the first focus point detecting module may be realizedby using a focus point detecting system of the eye, the focus pointdetecting system of the eye will be detailed below, and the details arenot described here.

b) As shown in FIG. 3d , the first object determining sub-unit 310′ maycomprise a second focus point detecting module 310 b′ configured totrack the line-of-sight directions of two eyes to obtain the position ofthe focus point of the eye through the intersection of the line-of-sightdirections of the two eyes.

c) As shown in FIG. 3e , the first object determining sub-unit 310′ maycomprise a third focus point detecting module 310 c′ configured to trackthe line-of-sight directions of the eye, obtain the scene depth of theposition of the focus point containing the eye according to theline-of-sight directions, and calculate and obtain the position of thefocus point of the eye according to the scene depth.

2) As shown in FIG. 3f , the object determining unit 310 may comprise asecond object determining sub-unit 310″ configured to collect the fundusimages and determine the gazing object according to the fundus images.

There is a macular area in the center of the retina of human fundus, andthe macular area, located in the central optical zone of human eyes, isa projection point of the eyes light axis. A depression in the center ofthe yellow spot, known as a central fovea, is the sharpest part of aneye, and the eye's gazing object is projected to the central fovea ofthe macular area. Accordingly, the user's gazing object may bedetermined by collecting the corresponding images at the central foveaof the macular area in the fundus images.

The imaging lens group 320 comprises at least two lenses, and the atleast two lenses being adjustable in the scaling property with eachcorresponding portion of the sub-areas. The scaling property may beadjusted by changing the respective focal lengths of the at least twolenses or by changing the relative position between the at least twolenses. In the imaging lens group, the sub-areas are distributed in anarray, such as in a rectangular array, or distributed in a radialconcentric circle array.

When the corresponding sub-areas of the imaging lens group 320 aredetermined by the sub-area determining unit 330, the correspondingsub-areas may be determined according to the projection of the gazingobject on the imaging lens group 320. The projection of the gazingobject on the imaging lens group along the line-of-sight directionscovers some relevant sub-areas, i.e., the corresponding sub-areas, andthese corresponding sub-areas covered by the projection are thesub-areas required to be adjusted in the scaling property.

After the sub-areas required to be adjusted in the scaling property aredetermined, the corresponding scaling parameter is required to bedetermined. The parameter determining unit 340 may use any one of thefollowing several implementations:

1) As shown in FIG. 3g , the parameter determining unit 340 may comprisea first parameter determining sub-unit 340′ configured to determine thescaling parameter of the corresponding sub-areas according to the actualviewing distance from the gazing object to the eye.

Specifically, as shown in FIG. 3h , in an optional implementation, thefirst parameter determining sub-unit 340′ may comprise:

an actual viewing distance acquiring module 341 a′ configured to acquirethe actual viewing distance from the gazing object to the eye. Wherein,acquiring the actual viewing distance from the gazing object to the eyemay be realized according to the equivalent focal length of the eyeacquired by the first focus point detecting module or by calculating thesame according to the position of the focus point of the eye acquired bythe second focus point detecting module or the third focus pointdetecting module.

a parameter determining module 342 a′ configured to determine thescaling parameter of the corresponding sub-areas according to the actualviewing distance. Wherein, the scaling parameter of the correspondingsub-areas determined according to the actual viewing distance may be amagnification, and there are various modes configured to acquire themagnification according to the actual viewing distance; for example, thecorresponding magnification is determined according to a piecewisefunction corresponding to the viewing distance or by looking up thetable. This implementation selects a quick way of looking up table,i.e., presetting a corresponding relation table between the actualviewing distance and the magnification, and then determining thecurrently needed magnification by looking up the table during theimplementation of the method. The corresponding relation table betweenthe actual viewing distance and the magnification is shown in Table 1,and the details are not described here.

In another optional implementation, as shown in FIG. 3i , the firstparameter determining sub-unit 340′ comprises:

a presetting module 341 b′ configured to preset the target viewingdistance from the gazing object to the eye and the buffer of the targetviewing distance. Wherein, the target viewing distance is the viewingdistance of user's eye expected to reach, i.e., the desired value of theviewing distance when the user observes the gazing object, such as 10 m.When the user's eye's actual viewing distance is the target viewingdistance, the user will feel that the distance from the gazing object tohimself or herself is moderate and the fundus images will be not toolarge or too small. Besides, the target viewing distance that makes theuser feel comfortable is generally not a distance point, but rather adistance range; accordingly, the buffer of the target viewing distanceis also arranged in the mode e. Generally, the buffer of the targetviewing distance is the distance range preset between both sides of thetarget viewing distance. For example, assuming that the target areaproportion is D_(T), the buffer may be ((D_(T)−D_(L), D_(T))∪(D_(T),D_(T)+D_(R))), wherein, D_(T), D_(L) and D_(R) are constants.Consequently, the scope of viewing distance (D_(T)−D_(L), D_(T)+D_(R))is set as the scope of viewing distance that makes the user feelcomfortable. D_(L) may be equal to D_(R); in this case, the firstsub-buffer ((D_(T)−D_(L), D_(T)) and the second sub-buffer (D_(T),D₁+D_(R)) of the buffer of the target viewing distance are of equal sizeand take D_(T) as the center; and D_(L) may also be unequal to D_(R); inthis case, the first sub-buffer ((D_(T)−D_(L), D_(T)) and the secondsub-buffer (D_(T), D_(T)+D_(R)) vary in size.

an actual viewing distance acquiring module 342 b′ configured to acquirethe actual viewing distance from the gazing object to the eye. Theactual viewing distance acquiring module may be the same as that in theabove implementation, and the details are not described here again.

a parameter determining module 343 b′ configured to determine thescaling parameter of the corresponding sub-areas according to the targetviewing distance, the actual viewing distance and the buffer.

Wherein, in the step of determining the scaling parameter of thecorresponding sub-areas according to the target viewing distance, theactual viewing distance and the buffer, for the scaling parameter:

Under the circumstance that the actual viewing distance is less than thetarget viewing distance and the actual viewing distance is beyond thebuffer of the target viewing distance, after the scaling property of thecorresponding sub-areas is adjusted according to the scaling parameter,the actual viewing distance will be increased to the target viewingdistance, to shrink the fundus images of the gazing object.

Under the circumstance that the actual viewing distance is greater thanthe target viewing distance and the actual viewing distance is beyondthe buffer of the target viewing distance, after the scaling property ofthe corresponding sub-areas is adjusted according to the scalingparameter, the actual viewing distance will be decreased to the targetviewing distance, to amplify the fundus images of the gazing object.

In some implementations demanding simple control, the buffer of thetarget viewing distance may be set as zero, i.e., equivalent to thebuffer without setting the target viewing distance; in this case, thisis equivalent to determining the scaling parameter of the correspondingsub-areas according to the target viewing distance and the actualviewing distance, for the scaling parameter:

Under the circumstance that the actual viewing distance is less than thetarget viewing distance, after the scaling property of the correspondingsub-areas is adjusted according to the scaling parameter, the actualviewing distance will be increased to the target viewing distance, toamplify the fundus images of the gazing object.

Under the circumstance that the actual viewing distance is greater thanthe target viewing distance, after the scaling property of thecorresponding sub-areas is adjusted according to the scaling parameter,the actual viewing distance will be decreased to the target viewingdistance, to amplify the fundus images of the gazing object.

2) As shown in FIG. 3j , the parameter determining unit 340 may comprisea second parameter determining sub-unit 340″ configured to determine thescaling parameter of the corresponding sub-areas according to the actualarea proportion of the fundus images of the gazing object on the fundus.

Specifically, as shown in FIG. 3k , in an optional implementation, thesecond parameter determining sub-unit 340″ may comprise:

an actual area proportion acquiring module 341 a″ configured to acquirethe actual area proportion of the fundus images of the gazing object onthe fundus. Wherein, the area of the user's fundus is generally fixed,after the user's fundus images are collected, the images in the centralfovea area of the yellow spot may be extracted therefrom and used as thefundus images of the gazing object, such that the area of the fundusimages of the gazing object may be acquired and then the actual areaproportion of the fundus images of the gazing object on the fundus maybe acquired.

a parameter determining module 342 a″ configured to determine thescaling parameter of the corresponding sub-areas according to the actualarea proportion. Wherein, the scaling parameter of the correspondingsub-areas determined according to the actual area proportion may be amagnification, and there are various modes configured to determine thecorresponding magnification according to the actual area proportion; forexample, the corresponding magnification is determined according to thepiecewise function corresponding to the actual area proportion or bylooking up the table. This implementation selects a quick way of lookingup table, i.e., presetting a corresponding relation table between theactual area proportion and the magnification, and then determining thecurrently needed magnification by looking up the table during theimplementation of the method. Wherein, the corresponding relation tablebetween the actual area proportion and the magnification is shown inTable 2, and the details are not described here again.

As shown in FIG. 3L, in another optional implementation, the secondparameter determining sub-unit 340″ may comprise:

a presetting module 341 b″ configured to preset the target areaproportion of the fundus images of the gazing object on the fundus andthe buffer of the target area proportion. Wherein, the target areaproportion is the area proportion of the fundus images of the gazingobject on the fundus expected to achieve, such as 50%. Under thecircumstance that the area proportion of the fundus images of the gazingobject on the fundus is the target area proportion, the user will feelthat the distance from the gazing object to himself or herself ismoderate and the fundus images will be neither too large nor too small.Besides, the area proportion of the fundus images of the gazing objectthat makes the user feel comfortable is generally not an area proportionpoint, but rather an area proportion range; accordingly, the buffer ofthe target area proportion is also arranged in the mode g. Generally,the buffer is the area proportion range preset between both sides of thetarget area proportion. For example, assuming that the target areaproportion is S_(T), the buffer may be ((S_(T)−S_(L), S_(T))∪(S_(T),S_(T)+S_(R))), wherein, S_(T), S_(L) and S_(R) are constants.Consequently, the region of area proportion (S_(T)−S_(L), S_(T)+S_(R))is set as the region of area proportion that makes the user feelcomfortable. S_(L) may be equal to S_(R); in this case, the thirdsub-buffer (S_(T)−S_(L), S_(T)) and the fourth sub-buffer (S_(T),S_(T)+S_(R)) of the buffer are of equal size and take S_(T) as thecenter; and S_(L) may also be unequal to S_(R); in this case, the thirdsub-buffer (S_(T)−S_(L), S_(T)) and the fourth sub-buffer (S_(T),S_(T)+S_(R)) vary in size.

an actual area proportion acquiring module 342 b″ configured to acquirethe actual area proportion of the fundus images of the gazing object onthe fundus. The actual area proportion acquiring module may be the sameas that in the above implementation, and the details are not describedhere.

a parameter determining module 343 b″ configured to determine thescaling parameter of the corresponding sub-areas according to the targetarea proportion, the actual area proportion and the buffer.

Wherein, in the step of determining the scaling parameter of thecorresponding sub-areas according to the target area proportion, theactual area proportion and the buffer, for the scaling parameter:

In the case that the actual area proportion is less than the target areaproportion and the actual area proportion is beyond the buffer, afterthe scaling property of the corresponding sub-areas is adjustedaccording to the scaling parameter, the fundus images of the gazingobject may be amplified to the target area proportion.

In the case that the actual area proportion is greater than the targetarea proportion and the actual area proportion is beyond the buffer,after the scaling property of the corresponding sub-areas is adjustedaccording to the scaling parameter, the fundus images of the gazingobject may be shrunk to the target area proportion.

In some implementations demanding simple control, the buffer may also beset at zero, i.e., it is equivalent to not setting the buffer, meanwhileequivalent to determining the scaling parameter of the correspondingsub-areas according to the target area proportion and the actual areaproportion, and for the scaling parameter:

In the case that the actual area proportion is less than the target areaproportion, after the scaling property of the corresponding sub-areas isadjusted according to the scaling parameter, the fundus images of thegazing object may be amplified to the target area proportion.

In the case that the actual area proportion is greater than the targetarea proportion, after the scaling property of the correspondingsub-areas is adjusted according to the scaling parameter, the fundusimages of the gazing object may be shrunk to the target area proportion.

In order to avoid the condition that the fundus images of the user ischanged in ungazing state, such as random sweeping, to affect the userexperience, as shown in FIG. 4, the device may also comprise:

a time judging unit 410 configured to judge whether the time for the eyeto observe the gazing object exceeds the predetermined time, and if itexceeds the predetermined time, enabling the sub-areas determining unit330, the imaging lens group 320 and the parameter determining unit 340.

Wherein, the predetermined time shall be set in such a manner to justmake sure that the user is gazing the current observation object, andgenerally, when human eyes view a target, an optical impression may beobtained with the minimum observation time of 0.07-0.3 s, and thepredetermined time shall be more than the minimum observation time; forexample, it may be set at 1 s, 2 s, etc. In addition, the time for theuser to observe the gazing object may be obtained by monitoring the timethat the position of the focus point of the user's eye remainsunchanged, and in the case that the time that the position of the focuspoint of the user's eye remains unchanged exceeds the predeterminedtime, it can be judged that the user is gazing the object currently inthe position of the focus point, or obtained by monitoring the dwelltime of the corresponding image in the central fovea of the yellow spot,and in the case that the dwell time of the corresponding image of thesame object in the central fovea exceeds the predetermined time, it canbe judged that the user is gazing the object currently.

When the gazing object is a mobile object, the judgment is only made inthe beginning on whether the time for the eye to observe the mobileobject exceeds the predetermined time, once the time is judged to exceedthe predetermined time, the sub-area determining unit 330, the imaginglens group 320 and the parameter determining unit 340 are enabled, andwhen the user's line-of-sight follows the mobile object, the judgmentwould not be performed again on whether the gazing time exceeds thepredetermined time as long as the user's eye are gazing the mobileobject all the time (the user needs not to turn the head but to moveeyeballs only), thereby facilitating the user in observing the scalingof the mobile object.

In addition, human eyes may have ametropia problems such asfarsightedness, nearsightedness and/or astigmatism, therefore, thedevice also comprises:

a refraction judging unit 420 configured to judge whether the eye haveametropia problems and generating the ametropia information about theeye if the eye have ametropia problems;

Correspondingly, the parameter determining unit 340 configured todetermine the scaling parameter of the corresponding sub-areas accordingto the gazing object and the ametropia information.

In addition, in order to adjust the imaging lens group 320, the devicealso comprises:

a property adjusting unit 430 configured to adjust the scaling propertyof the corresponding sub-areas according to the scaling parameter.

As shown in FIG. 5a , the above mentioned focus point detecting systemof an eye is described as follows, the focus point detecting system ofthe eye 500 may comprise:

an image collecting device 510 configured to collect the image presentedon the fundus;

an adjusting device 520 configured to adjust the imaging parameterbetween the eye and the image collecting device 510 so that the imagecollecting device 510 obtains an image with the definition greater thanthe preset value;

an image processing device 530 configured to process the image obtainedby the image collecting device 510, in order to obtain the opticalparameter of the eye corresponding to the image with the definitiongreater than the preset value.

The system 500 obtains the optical parameter of the eye corresponding tothe image with the definition greater than the preset value by analyzingand processing the fundus images, thereby calculating the currentposition of the focus point of the eye.

The images presented on the “fundus” herein are mainly the imagespresented on the retina, which may be the images of the fundus itself orimages of other objects projected to the fundus.

As shown in FIG. 5b , in a possible implementation, the image collectingdevice 510 is a micro-camera, and in another possible implementation ofthe embodiment of this application, the image collecting device 510 mayalso adopt a photosensitive imaging device directly, such as deviceslike CCD (Charge Coupled Device) or CMOS (Complementary Metal OxideSemiconductor).

In a possible implementation, the adjusting device 520 comprises: anadjustable lens unit 521 located in the optical path between the eye andthe image collecting device 510 with adjustable focal length of itselfand/or adjustable position in the optical path. Through the adjustablelens unit 521, the equivalent focal length of the system between the eyeand the image collecting device 510 may be adjusted, and through theadjustment by the adjustable lens unit 521, the image collecting device510 obtains the clearest image on the fundus in a certain position orstatus of the adjustable lens unit 521. In this implementation, theadjustable lens unit 521 performs continuous and real-time adjustment inthe detection process.

Wherein, in a possible implementation, the adjustable lens unit 521 is:a focal length adjustable lens configured to adjust the focal length ofitself by adjusting the refractivity and/or shape of itself.Specifically: 1) adjusting the focal length by adjusting the curvatureof at least one plane of the focal length adjustable lens, for example,adding or reducing the liquid medium in the cavity formed by thedouble-layer transparent layer to adjust the curvature of the focallength adjustable lens; 2) adjusting the focal length by changing therefractivity of the focus adjustable lens, for example, for the focusadjustable lens filled with specific liquid crystal media, adjusting thearrangement mode of the liquid crystal medium by adjusting the voltageof electrodes corresponding to the liquid crystal medium, therebychanging the refractivity of the focal length adjustable lens.

In another possible implementation, the adjustable lens unit 521comprises: a lens group configured to adjust the relative positionbetween the lenses of the lens group to adjust the focal length of thelens group.

In addition to the two methods above mentioned for changing the opticalpath parameter of the system by adjusting the property of the adjustablelens unit 521, the optical path parameter of the system may also bechanged by adjusting the position of the adjustable lens unit 521 in theoptical path.

Wherein, in a possible implementation, in order not to affect theviewing experience of the user on the observation object and in order toapply portably the system to the wearable device, the adjusting device520 also comprises: a spectroscopic device 522 configured to form thelight transmission paths between the eye and the observation object aswell as between the eye and the image collecting device 510. Therebyfolding the optical path, reducing the system volume and avoidingaffecting other experiences of the user as far as possible.

Wherein, in this implementation, the spectroscopic device comprises: afirst spectroscopic unit located between the eye and the observationobject configured to transmit the light from the observation object tothe eye and transfer the light from the eye to the image collectingdevice.

The first spectroscopic unit may be a spectroscope, a spectroscopicoptical waveguide (comprising optical fiber) or other suitablespectroscopic devices.

In a possible implementation, the image processing device 530 of thesystem comprises an optical path calibrating module configured tocalibrate the optical path of the system, for example, performing thealignment and calibration for the optical axis of the optical path, inorder to ensure the accuracy of the measurement.

In a possible implementation, the image processing device 530 comprises:

an image analyzing module 531 configured to analyze the image acquiredby the image collecting device to find out the image with the definitiongreater than the preset value; and

a parameter calculating module 532 configured to calculate the opticalparameter of the eye based on the image with the definition greater thanthe preset value as well as the known imaging parameter of the systemcorresponding to the image with the definition greater than the presetvalue.

In this implementation, the image collecting device 510 can acquire theimage with the definition greater than the preset value through theadjusting device 520, but it is required that the image with thedefinition greater than the preset value is found through the imageanalyzing module 531, and then, the optical parameter of the eye can becalculated based on the image with the definition greater than thepreset value and the known optical path parameter of the system. Theoptical parameter of the eye herein may comprise the optical axisdirection of the eye.

In a possible implementation of the embodiment of this application, thesystem also comprises: a projection device 540 configured to project thefacula to the fundus. In a possible implementation, the functions of theprojection device can be realized through a micro-projector.

The projected facula herein may have no specific pattern which is onlyconfigured to illuminate the fundus.

In a preferable implementation, the projected facula comprises a patternwith rich characteristics. Rich characteristics of the pattern mayfacilitate the detection, increasing the accuracy of detection. FIG. 5eshows an exemplary diagram of a facula pattern 550, and the pattern maybe formed by the facula pattern generator such as frosted glass; FIG. 5fshows the fundus images taken when the facula pattern 550 is projected.

In order not to affect the normal view of the eye, preferably, thefacula is the infrared facula invisible to the eye.

At this moment, in order to reduce the interference of other spectra:

The emergent surface of the projection device may be provided with atransmission filter of the light invisible to the eye.

The incident plane of the image collecting device may be provided with atransmission filter of the light invisible to the eye.

Wherein, in a possible implementation, the image processing device 530also comprises:

a projection control module 534 configured to control the brightness ofthe projected facula of the projection device according to the resultsobtained by the image analyzing module.

For example, the projection control module 534 can adaptively adjust thebrightness according to the characteristics of the images obtained bythe image collecting device 510. The characteristics of the imagesherein comprise the contrast of the image features and the texturefeature.

A special condition configured to control the brightness of projectedfacula of the projection device is to open or close the projectiondevice; for example, the projection device can be periodically closedwhen the user continues to gaze at one point; When the user's fundus isbright enough, the light emitting source can be closed to detect thedistance from the current focus point of the line-of-sight to the eye byonly the fundus information.

In addition, the projection control module 534 may further control thebrightness of projected facula of the projection device according to theambient light.

Wherein, in a possible implementation, the image processing device 530may also comprise: an image calibrating module 533 configured tocalibrate the fundus images to obtain at least one reference imagecorresponding to the image presented on the fundus.

The image analysis unit 531 contrast the image acquired by the imagecollecting device 530 with the reference image, thereby acquiring theimage with the definition greater than the preset value. Here, theimages with the definition greater than the preset value can be imagesobtained with the minimum difference from the reference image. In thisimplementation, the difference between the currently acquired image andthe reference image is calculated by the existing image processingalgorithm such as an automatic focusing algorithm using the classicalphase differences.

Wherein, in a possible implementation, the parameter calculating module532 comprises:

a determining unit of optical axis direction of the eye 5321 configuredto obtain the optical axis direction of the eye according to thecharacteristics of the eye corresponding to the image with thedefinition greater than the preset value. The line-of-sight directionmay be obtained according to the optical axis direction of the eye andthe fixed angle between the optical axis direction of the eye and theline-of-sight direction.

The characteristics of the eye herein can be obtained from the imagewith the definition greater than the preset value or acquiredadditionally.

Wherein, as shown in FIG. 5c , in a possible implementation, thedetermining unit of optical axis direction of the eye 5321 comprises: afirst determining sub-unit 5321 a configured to obtain the optical axisdirection of the eye according to the characteristics of the funduscorresponding to the image with the definition greater than the presetvalue. Compared with the optical axis direction of the eye obtainedthrough the surface characteristics of pupils and eyeballs, the opticalaxis direction of the eye is determined in a higher accuracy through thecharacteristics of the fundus.

When the facula pattern is projected to the fundus, the size of thefacula pattern may be larger than or smaller than the visible area inthe fundus, wherein:

When the area of the facula pattern is smaller than or equal to that ofthe visible area, the classical feature points match algorithm (such asScale Invariant Feature Transform (Scale Invariant Feature Transform,SIFT) algorithm) can be used to determine the optical axis direction ofthe eye by detecting the position of the facula pattern on the imagerelative to the fundus;

when the area of the facula pattern is greater than or equal to thevisible area of the fundus, the optical axis direction of the eye can bedetermined through the position of the facula pattern on the obtainedimage relative to the original facula pattern (obtained through theimage calibrating module), thereby determining the line-of-sightdirection of the user.

As shown in FIG. 5d , in another possible implementation, thedetermining unit of the optical axis direction of the eye 5321comprises: a second determination sub-unit 5321 b configured to obtainthe optical axis direction of the eye according to the characteristicsof the eye's pupils corresponding to the image with the definitiongreater than the preset value. The characteristics of pupils of the eyeherein may be acquired from the image with the definition greater thanthe preset value or acquired additionally. Obtaining the optical axisdirection of the eye through the characteristics of the eye's pupils isthe prior art, so it is not repeated herein.

Wherein, as shown in FIG. 5b , in a possible implementation, the imageprocessing device 530 also comprises: a calibrating module of opticalaxis direction of the eye 535 configured to calibrate the optical axisdirection of the eye, in order to determine the optical axis directionof the eye more accurately.

In this implementation, the known imaging parameter of the systemcomprises the fixed imaging parameter and the real-time imagingparameter, wherein the real-time imaging parameter is the parameterinformation of the adjustable lens unit corresponding to the image withthe definition greater than the preset value, and the parameterinformation can be obtained by real-time recording when the image withthe definition greater than the preset value is acquired.

After the current optical parameter of the eye is obtained, the distancefrom the focus point of the eye to the eye may be calculated as follows:

FIG. 5g shows a schematic diagram of the eye imaging, and in combinationwith the lens imaging formula in the classical optical theory, theformula (1) can be obtained from FIG. 5g :

$\begin{matrix}{{\frac{1}{d_{o}} + \frac{1}{d_{e}}} = \frac{1}{f_{e}}} & (1)\end{matrix}$

wherein, d_(o) and d_(e), are the distances from the current observationobject 5010 of the eye and the real image 5020 on the retina to theequivalent lens 5030 of the eye respectively, f_(e) is the equivalentfocal length of the equivalent lens 5030 of the eye and X is theline-of-sight direction of the eye.

FIG. 5h shows a schematic diagram of obtaining the distance from thefocus point of the eye to the eye according to the known opticalparameter of the system and the optical parameter of the eye, the facula5040 in FIG. 5h may form a virtual image through the adjustable lensunit 521; and assuming that the distance from the virtual image to thelens is x, the system of equations may be obtained by combining theformula (1) as follows:

$\begin{matrix}{\quad\left\{ \begin{matrix}{{\frac{1}{d_{p}} - \frac{1}{x}} = \frac{1}{f_{p}}} \\{{\frac{1}{d_{i} + x} + \frac{1}{d_{e}}} = \frac{1}{f_{e}}}\end{matrix} \right.} & (2)\end{matrix}$

Wherein, d_(p) is the optical equivalent distance from the facula 5040to the adjustable lens unit 521; d₁ is the optical equivalent distancefrom the adjustable lens unit 521 to the equivalent lens 5030 of theeye; f_(p) is the value of the focal length of the adjustable lens unit521; and d₁ is the distance from the equivalent lens 5030 of the eye tothe adjustable lens unit 521.

From formulas (1) and (2), the distance d_(o) from the currentobservation object 5010 (focus point of the eye) to the equivalent lens5030 of the eye (i.e. the actual distance of focus point of the eye) canbe obtained, as shown in formula (3):

$\begin{matrix}{d_{o} = {d_{i} + \frac{d_{p} \cdot f_{p}}{f_{p} - d_{p}}}} & (3)\end{matrix}$

According to the actual distance of focus point of the eye and theline-of-sight, the position of the focus point of the eye may beobtained.

FIG. 6 shows a diagram of a specific example when the focus pointdetecting system of the eye 600 is applied to glasses in an embodimentof this application. The focus point detecting system of the eye 600 canbe configured to realize the function of the first focus point detectingmodule.

Wherein, the function of the micro-camera 610 is the same as that of theimage collecting device in FIG. 5b , and in order to not affect theline-of-sight for the user to normally view the object, the micro-camerais arranged on the right outboard of the glasses;

the function of the first spectroscope 620 is the same as that of thefirst spectroscopic unit shown in FIG. 5b , and the first spectroscope620 is arranged at the intersection of the gazing direction of the eyeand the incidence direction of the camera 610 at a certain angle ofinclination, to transmit the light of the gazing object entering the eye200 and reflect the light from the eye 200 to the camera 610; and

the function of the focal length adjustable lens 630 is the same as thatof the focal length adjustable lens in FIG. 5b , and the focal lengthadjustable lens is located between the first spectroscope 620 and thecamera 610 to adjust the focal length value in real time, such that thecamera 610 can capture the clearest image on the fundus at a certainfocal length value.

In this implementation, the image processing device is not shown in FIG.6, and the function thereof is the same as that of the image processingdevice shown in FIG. 5 b.

Generally, the fundus is not bright enough, so it is better toilluminate the fundus, and in this implementation, the fundus isilluminated by a light emitting source 640. In order not to influenceusers' experience, the preferable light emitting source 640 herein maybe the light invisible to the eye, therefore, a near-infrared lightemitting source which may have a weak impact on the eye 200 and isrelatively sensitive to the camera 610 is preferable.

In this implementation, the light emitting source 640 is located on theoutside of the right eyeglasses frame, so the light emitted by the lightemitting source 640 may be transmitted to the fundus through a secondspectroscope 650 and the first spectroscope 620 together. In thisimplementation, the second spectroscope 650 is also located in front ofthe incident plane of the camera 610, so the light from the fundus tothe second spectroscope 650 is also required to be transmitted.

It can be seen that in this implementation, in order to improve users'experience and enhance the clarity of collection of the camera 610, thefirst spectroscope 620 may have the property of high infraredreflectivity and high transmission rate of visible light. For example,the above property may be achieved by arranging an infrared reflectivefilm on the side of the first spectroscope 620 toward the eye 200.

It can be seen from FIG. 6 that in this implementation, the focus pointdetecting system of the eye 600 is located on the side of glasses lensesaway from the eye 200, so the lens may be regarded as a part of glasseswhen the eye optical parameter is calculated, without knowing about theoptical property of the lens.

In other implementations of the embodiment of this application, thefocus point detecting system of the eye 600 may be located on the sideof the glasses lenses near the eye 200, and in this case, it is requiredthat the optical property parameter of the lens is obtained in advanceand the influencing factors of the lens are considered when the distanceof the focus point is calculated.

The light emitted from the light emitting source 640 passes through theglasses lenses and enters users' eye through the reflection of thesecond spectroscope 650, the projection of the focal length adjustablelens 630 and the reflection of the first spectroscope 620, and finallyarrives at the retina of fundus; The camera 610 captures the image onthe fundus through the optical path formed by the first spectroscope620, the focal length adjustable lens 630 and the second spectroscope650 by passing through the pupil of the eye 200.

FIG. 7a is a schematic diagram of a specific example when the device ofthe embodiment of this application is applied to the glasses, wherein,the glasses may be both ordinary glasses or optical devices such ashelmet, front windshield and contact lens. As shown in FIG. 7a , theglasses of the embodiment use the focus point detecting system of theeye 600 to determine the gazing object of the eye, i.e., realizing thefunction of the object determining unit 310, and the realization of thefocus point detecting system of the eye 400 is not repeated.

Wherein, the imaging lens group 320 is arranged in the lens, andcomprises at least two lenses and is divided into a plurality ofsub-areas, and the part of the at least two lenses corresponding to thesub-areas being adjustable in the scaling property. For simplicity, theimaging lens group 320 in FIG. 7a comprises the first lens 321 on theside near the eye and the second lens 322 on the side near the gazingobject.

Wherein, the scaling property may be adjusted by changing the focallengths of the at least two lenses respectively, and the focal lengthsmay be adjusted in the following methods: 1) adjusting the focal lengthby adjusting the curvature of at least one plane of the lens, forexample, for the lens comprising a cavity formed by the double-layertransparent layer, adjusting the focal length by adding or reducing theliquid medium in the cavity formed by the double-layer transparentlayer. In this case, the scaling parameter above mentioned, for example,may mean that the liquid medium is reduced or increased by a certainvalue; 2) adjusting the focal length by changing the refractivity of thelens, for example, for the lens filled with specific liquid crystalmedium, adjusting the arrangement mode of the liquid crystal medium byadjusting the voltage of the electrode corresponding to the liquidcrystal medium, thereby changing the refractivity of the lens. In thiscase, the scaling parameter above mentioned, for example, may mean thatthe voltage of the electrode is increased or reduced by a certain value.

In addition to the focal length above mentioned, the scaling propertymay also be adjusted by changing the relative position between the atleast two lenses. Herein, the relative position between the lenses maybe changed by adjusting the relative distance between the lenses in theoptical axis direction, and/or the relative position between the lensesin the vertical optical axis direction, and/or the relative rotationangle around the optical axis.

Wherein, the first lens 321 may be set in such a manner that thecurvature on the side toward user's eye 200 is adjustable, the secondlens 322 is set in such a manner that the curvature on the side towardthe gazing object is adjustable, and the positions of the first lens 321and the second lens 322 is fixedly set, so that the glasses are simplein structure, lightweight and portable.

As shown by the first imaging lens group 3201 on the left of the glassesin FIG. 7b , in a possible implementation of the embodiment of thisapplication, the plurality of sub-areas 3201 c with adjustable scalingproperty are distributed in a rectangular array. In this embodiment, thesub-areas 3201 c are of the same size with the rows and columns aligned;and in other embodiments, the sub-areas 3201 c may also be set withunaligned rows and columns.

As shown by the second imaging lens group 3202 on the right of theglasses in FIG. 7b , the plurality of sub-areas 3202 c with adjustablescaling property are distributed in a radial concentric circle(consisting of several concentric circles 3202 d and several radiallines 3202 e radially connecting adjacent concentric circles 3202 d)array. In this embodiment, the radial lines 3202 e of the radialconcentric circles are aligned, and in other embodiments, the radiallines 3202 e between two adjacent concentric circles 3202 d may also beunaligned.

In FIG. 7b of the implementation, for description, two imaging lensgroups 320 in sub-areas with different distributions are set in a pairof glasses, and in practical application, the left and right imaginglens groups 320 of a pair of glasses are generally the same or similarin the sub-area distribution.

Of course, it may be known to the technical personnel in the field thatin addition to the rectangular array and the radial concentric circlearray above, the sub-areas may also be distributed in other arrays orunarrayed mode.

The sub-area determining unit 330 is configured to determine thecorresponding sub-areas according to the projection of the gazing objecton the imaging lens group, wherein, the projection is a projection ofthe gazing object on the imaging lens group in the line-of-sightdirection, and may be calculated according to the relative positionbetween the imaging lens group 320 and the gazing object and theline-of-sight direction.

The parameter determining unit 340 may determine the scaling parameterof the corresponding sub-areas according to the actual viewing distancefrom the gazing object to the eye or the actual area proportion of thefundus images of the gazing object on the fundus, and see relevantdescription of step S230 in the method embodiment for the specificdetermination method.

Generally, the sub-area determining unit 330 and the parameterdetermining unit 340 may be realized by integrating into the sameprocessor, thereby reducing the weight of the glasses and increasing theportability thereof. The processor may be a Central Processing Unit CPU,or a specific integrated circuit ASIC (Application Specific IntegratedCircuit), or one or more integrated circuits configured to implement theembodiment of this application.

The property adjusting unit 430 is not shown in FIG. 7a , it generallyadjusts the scaling property of the corresponding sub-areas byoutputting the voltage or current signals corresponding to the scalingparameter to the imaging lens group 320.

In addition, the glasses may also comprise the time judging unit 410 andthe refraction judging unit 420.

Wherein, the time judging unit 410 generally comprises a timerconfigured to monitor the time that the position of the focus point ofuser's eye remains unchanged, or monitoring the dwell time of thecorresponding image in the central fovea of the yellow spot, and in thecase that the time that the position of the focus point of user's eyeremains unchanged exceeds the predetermined time; or, the dwell time ofthe corresponding image of the same object in the central fovea exceedsthe predetermined time, it can be judged that the user is gazing theobject currently.

The refraction judging unit 420 may be realized by using the existingrefraction detecting device, and it is a prior art and the details arenot described here.

FIG. 8a and FIG. 8b are diagrams of this application scenes of thedevice 300 of this application. FIG. 8a is a schematic diagram of theoriginal view of the user driving a car, wherein, the front car 810 isthe car in front of the car driven by the user (not shown), the side car820 is the car in side front of the car driven by the user, and theracing line 830 is the lane line between the car driven by the user andthe side car 820. Assuming that the user demands to view carefully thelicense plate number of the front car 810 at this time to identifywhether his/her friend is driving the car, but the front car 810 is at adistance of more than 100 m and the license plate number cannot beidentified by naked eyes.

FIG. 8b is a schematic diagram of the view obtained through the device300 by the user, it can be seen that the front car 810 is brought closeand the license plate number thereof 123456 is clear, at the same time,the side car 820 and the racing line 830 are still in the view and keepthe original distance from the car, thereby facilitating in increasingthe driving safety of the user.

The structure of the imaging device for local scaling of the embodimentof the present invention is shown in FIG. 9. The specific embodiment ofthe present invention is not intended to limit the specificimplementation of the imaging device for local scaling, as shown in FIG.9, the imaging device 900 may comprise:

a processor 910, a Communications Interface 920, a memory 930 and acommunication bus 940. Wherein:

The processor 910, the communications interface 920 and the memory 930complete the mutual communication through the communication bus 940.

The communications interface 920 is configured to communicate with othernetwork elements.

The processor 910 is configured to implement the program 932,specifically, it can implement the relevant steps in the methodembodiment shown in FIG. 9 above.

Specifically, the program 932 may comprise the program codes whichcomprise the computer operating instructions.

The processor 910 may be a Central Processing Unit CPU, or a specificintegrated circuit ASIC (Application Specific Integrated Circuit), orone or more integrated circuits configured to implement the embodimentof the present invention.

The memory 930 is configured to store the program 932. The memory 930may contain a high-speed RAM memory and may also comprise a non-volatilememory, such as at least one disk memory. Specifically, the program 932may execute the following steps:

determining the gazing object of an eye;

determining the corresponding sub-areas of the imaging lens groupaccording to the gazing object; the imaging lens group being configuredto scale and image for the gazing object, comprising a plurality ofsub-areas with adjustable scaling property;

and determining the scaling parameter of the corresponding sub-areasaccording to the gazing object.

For the specific implementation of the steps in the program 932, see thecorresponding steps or modules in the above-mentioned embodiment, andthe details are not described here. It may be clearly understood bypersons skilled in the art that, for the purpose of convenient and briefdescription, for the detailed working process of the above mentioneddevice and module, refer to the corresponding process description in theabove-mentioned method embodiment, and the details are not describedhere again. In summary, in the device of the embodiment, the user'sfundus images of the gazing object can be scaled in a local scalingmode, so as to avoid changing the overall view of the user and to enablethe user to conveniently observe the gazing object and to simultaneouslycorrectly perceive the surrounding environment.

Common persons skilled in the art should appreciate that, in combinationwith the examples described in the embodiments here, units and methodsteps can be implemented by electronic hardware, or a combination ofcomputer software and electronic hardware. Whether the functions areexecuted by hardware or software depends on the particular applicationsand design constraint conditions of technical schemes. Professionalpersons skilled in the art may use different methods to implement thedescribed functions for each particular application, but it should notbe considered that the implementation goes beyond the scope of thisapplication.

When being implemented in the form of a software functional unit andsold or used as a separate product, the functions may be stored in acomputer-readable storage medium. Based on this understanding, thetechnical scheme of this application, in essence, or the partcontributing to the prior art or the part of the technical scheme may beembodied in the form of software product, and the computer softwareproduct is stored in a readable storage medium and comprises variousinstructions for enabling a computer apparatus (which may be a personalcomputer, a server, a network apparatus, etc.) to implement all orpartial steps of the method of each embodiment of this application.However, the above-mentioned storage medium comprises any medium thatmay store program codes, such as a U-disk, a removable hard disk, aRead-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk,or an optical disk.

The above implementations are only used for illustrating thisapplication, and not intended to limit this application, and variousmodifications and improvements may be made by the ordinary technicalpersonnel in relevant technical field within the spirit and scope ofthis application; accordingly, all equivalent technical schemes belongto the scope of this application and the scope of patent protection ofthis application should be limited by Claims.

The invention claimed is:
 1. A method, comprising: determining, by asystem comprising a processor, a gazed object at which an eye is gazing;determining corresponding sub-areas of an imaging lens group accordingto the gazed object, the imaging lens group being configured to scaleand image for the gazed object and comprising a plurality of sub-areaswith adjustable scaling property; and determining a scaling parameter ofthe corresponding sub-areas according to the gazed object, wherein thedetermining the gazed object comprises: detecting a position of a focuspoint of the eye according to an optical parameter corresponding toimages presented on the fundus and with a defined clarity determined tobe greater than a preset value, wherein the optical parameter is theoptical parameter of an optical path between an image collectionposition and the eye; and determining the gazed object according to theposition of the focus point of the eye.
 2. The method of claim 1,wherein the determining the position of the focus point of the eyeaccording to the optical parameter corresponding to the images presentedon the fundus and with the defined clarity determined to be greater thanthe preset value comprises: collecting fundus images; adjusting theimaging parameter of the optical path between the eye and the imagecollection position for collecting a set of images with the definedclarity determined to be greater than the preset value; processing thefundus images; acquiring the optical parameter of the eye according toan imaging parameter corresponding to the set of images with the definedclarity determined to be greater than the preset value, wherein theimaging parameter is the imaging parameter of the optical path betweenthe image collection position and the eye; and determining the positionof the focus point of the eye according to the optical parameter of theeye.
 3. The method of claim 2, wherein the optical parameter of the eyecomprises an equivalent focal length and a line-of-sight direction ofthe eye.
 4. The method of claim 1, wherein the imaging lens groupcomprises at least two lenses, and the at least two lenses areadjustable in scaling property with respective portions of thecorresponding sub-areas.
 5. The method of claim 4, wherein the scalingproperty is adjusted by changing respective focal lengths of the atleast two lenses.
 6. The method of claim 4, wherein the scaling propertyis adjusted by changing a relative position between the at least twolenses.
 7. The method of claim 1, wherein the plurality of sub-areas aredistributed in an array.
 8. The method of claim 1, wherein thedetermining the corresponding sub-areas of the imaging lens groupaccording to the gazed object comprises: determining the correspondingsub-areas according to a projection of the gazed object on the imaginglens group.
 9. The method of claim 1, wherein the determining thescaling parameter of the corresponding sub-areas according to the gazedobject comprises: determining the scaling parameter of the correspondingsub-areas according to an actual viewing distance from the gazed objectto the eye.
 10. The method of claim 1, wherein the determining thescaling parameter of the corresponding sub-areas according to the gazedobject comprises: determining the scaling parameter of the correspondingsub-areas according to an actual area proportion of the fundus images ofthe gazed object on the fundus.
 11. The method of claim 1, furthercomprising: determining whether a time for the eye to observe the gazedobject exceeds a predetermined time, and in response to the time for theeye to view the gazed object being determined to exceed thepredetermined time, determining the corresponding sub-areas of theimaging lens group according to the gazed object and determining thescaling parameter of the corresponding sub-areas according to the gazedobject.
 12. The method of claim 1, further comprising: determiningwhether the eye has ametropia and generating ametropia information aboutthe eye in response to the eye being determined to have ametropia,wherein the determining the scaling parameter of the correspondingsub-areas according to the gazed object comprises: determining thescaling parameter of the corresponding sub-areas according to the gazedobject and the ametropia information.
 13. The method of claim 1, furthercomprising: adjusting the scaling property of the correspondingsub-areas according to the scaling parameter.
 14. An imaging device,comprising: an object determining unit configured to determine a gazedobject of an eye; an imaging lens group configured to scale and imagefor the gazed object, comprising a plurality of sub-areas with anadjustable scaling property; a sub-area determining unit configured todetermine corresponding sub-areas of the imaging lens group according tothe gazed object; and a parameter determining unit configured todetermine a scaling parameter of the corresponding sub-areas accordingto the gazed object, wherein the object determining unit comprises: afirst object determining sub-unit configured to detect a position of afocus point of the eye and determine the gazed object according to theposition of the focus point of the eye, wherein the first objectdetermining sub-unit comprises: a first focus point detecting moduleconfigured to determine the position of the focus point of the eyeaccording to an optical parameter corresponding to images presented on afundus and with a defined clarity determined to be greater than a presetvalue, wherein the optical parameter is the optical parameter of anoptical path between an image collection position and the eye.
 15. Theimaging device of claim 14, wherein the first focus point detectingmodule comprises: an image collecting sub-module configured to collectfundus images; an image adjusting sub-module configured to adjust theoptical parameter of the optical path between the eye and the imagecollection position and configured to collect a set of images with thedefined clarity determined to be greater than a preset value; an imageprocessing sub-module configured to process the collected images;acquire the optical parameter of the eye according to an imagingparameter corresponding to the images with the defined clarity greaterthan the preset value; and a focus point determining sub-moduleconfigured to determine the position of the focus point of the eyeaccording to the optical parameter of the eye.
 16. The imaging device ofclaim 14, wherein the imaging lens group comprises at least two lenses,and the at least two lenses are adjustable in scaling property with eachportion of the corresponding sub-areas.
 17. The imaging device of claim14, wherein the plurality of sub-areas are distributed in an array. 18.The imaging device of claim 14, wherein the sub-area determining unit isconfigured to determine the corresponding sub-areas according to theprojection of the gazed object on the imaging lens group.
 19. Theimaging device of claim 14, wherein the parameter determining unitcomprises: a first parameter determining sub-unit configured todetermine the scaling parameter of the corresponding sub-areas accordingto an actual viewing distance from the gazed object to the eye.
 20. Theimaging device of claim 14, wherein the parameter determining unitcomprises: a second parameter determining sub-unit configured todetermine the scaling parameter of the corresponding sub-areas accordingto an actual area proportion of fundus images of the gazed object on afundus.
 21. The imaging device of claim 14, wherein the device furthercomprises: a time judging unit configured to determine whether a timefor the eye to view the gazed object exceeds a predetermined time, andif the time for the eye to view the gazed object exceeds thepredetermined time, enabling the sub-area determining unit, the imaginglens group and the parameter determining unit.
 22. The imaging device ofclaim 14, wherein the device further comprises: a refraction judgingunit configured to determine whether the eye has ametropia problems andgenerate ametropia information of the eye if the eye has ametropiaproblems, and wherein the parameter determining unit is furtherconfigured to determine the scaling parameter of the correspondingsub-areas according to the gazed object and the ametropia information.23. The imaging device of claim 14, wherein the device furthercomprises: a property adjusting unit configured to adjust the scalingproperty of the corresponding sub-areas according to the scalingparameter.
 24. The imaging device of claim 14, wherein the device is apair of glasses.
 25. A computer readable storage device, comprising atleast one executable instruction, which, in response to execution,causes an imaging device comprising a processor to perform operations,comprising: determining a gazed object of an eye; determiningcorresponding sub-areas of an imaging lens group according to the gazedobject; and determining a scaling parameter of the correspondingsub-areas according to the gazed object, wherein the determining thegazed object comprises: detecting a position of a focus point of the eyeaccording to an optical parameter corresponding to images presented onthe fundus and with a defined clarity determined to be greater than apreset value, wherein the optical parameter is the optical parameter ofan optical path between an image collection position and the eye; anddetermining the gazed object according to the position of the focuspoint of the eye.
 26. An imaging device, characterized by comprising aprocessor and a memory, the memory storing the executable instructions,the processor being connected with the memory through a communicationbus, wherein, when the imaging device is operating, the processorexecutes or facilitates execution of the executable instructions storedby the memory to cause the imaging device to perform operations,comprising: determining a gazed object of an eye; determiningcorresponding sub-areas of an imaging lens group according to the gazedobject; and determining a scaling parameter of the correspondingsub-areas according to the gazed object, wherein the determining thegazed object comprises: detecting a position of a focus point of the eyeaccording to an optical parameter corresponding to images presented onthe fundus and with a defined clarity determined to be greater than apreset value, wherein the optical parameter is the optical parameter ofan optical path between an image collection position and the eye; anddetermining the gazed object according to the position of the focuspoint of the eye.